package lab02.test02;

/**
 * Created by ASUS on 2017/10/12.
 */
public class Circle {

    //属性：半径
    double radius;

    //行为：圆的面积与周长

    //计算面积
    double area(){

        return 3.14 * radius * radius;
    }

    //计算周长
    double perimeter(){

        return 2 * 3.14 * radius;
    }

}
